Venting a tent 39x39x79 and 400w MH/HPS

About to build my little grow tent and was thinking about venting. I know the 400w MH/HPS going to generate heat so I was thinking on having 4 fans in total:
1 oscillating fan to make the ladies strong and circulate air and three vent fans

2 6" fans (one in and one exhaust) and
1 4" fan (exhaust only).

The 4" would be on top of the tent (hot air rises) while the 6" will be on either side. My room (where the tent will be in is about 75 degrees most of the time.

With this much ventilation, should I be ok? I rather have only one exhaust so I only have one carbon filter (on exhaust of course).

Also if I go with 6" in and 4" exhaust, is that a problem since I will be pumping in more air than is leaving per minute?

How about vice versa (4" in and 6" exhaust)?

Should I just stick with 2 6" fans and forgo the 4" fan?

Thanks guys

Rippey

Im useing a 4" inline fan,and a fan, for my DR80.It suck air in from my window into my tent.The other fan is just to strenghten the stem and also move the air around a lil.No need for odor control ,when it comes to NL.

not near a window so I am going to be sucking in air from the next room through the dropped ceiling. I am going to start with G13 Labs Poison Dwarf (http://www.cannabis-seeds-bank.co.uk/g13-labs-poison-dwarf-autoflowering-4826-p.asp) since it is a fast flowering plant (5 weeks).

Rippey